<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>018-HTML5-MathML-实例2-第三方库</title>
    <script type="text/javascript" src="https://static.runoob.com/assets/js/mathml/mspace.js"></script>
</head>

<body>
    <math xmlns="http://www.w3.org/1998/Math/MathML">

        <mrow>
            <mrow>

                <msup>
                    <mi>x</mi>
                    <mn>2</mn>
                </msup>

                <mo>+</mo>

                <mrow>
                    <mn>4</mn>
                    <mo>⁢</mo>
                    <mi>x</mi>
                </mrow>

                <mo>+</mo>
                <mn>4</mn>

            </mrow>

            <mo>=</mo>
            <mn>0</mn>

        </mrow>
    </math>

</body>

</html>